Henry e



(No Model.)

I H. EJWAITE.

RECEIVER FOR TELEPHONES.

No. 250,306. Patented Nov. 29,1881.

caved m z? UNITED STATES PATENT OFFICE.

HENRY E. WAITE, OF BRIDGEPORT, CONNECTICUT, ASSIGNOR TO CHARLES E. LIVERMORE, OF NEW YORK, N. Y.

RECEIVER FOR TELEPHONES.

SPECIFICATION forming part of Letters Patent No. 250,306, dated November 29, 1881.

Application filed May 23, 1881.

To all whom it may concern:

Be it known that I, HENRY E.WAITE, of Bridgeport, county of Fairfield, State of Connecticut, have invented new and useful Improvements in Receivers for Telephones, of which the following is a full, clear, and exact description, reference being had to the accompanying drawing, making part of this specification, and which represents my improved receiver in section.

The invention relates to that class of receivers employing a metallic cup or sound-chamber inclosing a coil upon one end of a bar-magnet, and to which cup a cap or sounding-board is applied; and it consists in the combination, with the end of the magnet projecting within the cup, of a number (two or more) of thin flat disks of steel or other magnetic material,with the coil or helix arranged between them, formin g flattened extensions ofthe pole of the magnet with which they are connected, and serving to give increased distinotness to the variations or disturbances in degree of polarity in or between the different parts of the same pole of the magnet, and in the combination, with said inclosed disk or disks and coil, of a second coil applied to the same pole of the magnet outside of the cup, and operating thereon through the inclosed coil, as hereinafter explained.

In the accompanying drawing, A represents the body or handle of the receiver, provided with a cylindrical bore, adapting it to receive a bar-magnet, B, and chambered at its end to receive a coil or helix, C, surrounding said magnet near its outer end, as shown.

D is a metal cup secured to the magnet B and to the handle A over the coil 0, covering the same, and forming an .extension of the magnet and a hollow sound-chamber, to the open end of which the diaphragm or soundboard .E and ear-piece F are secured in any suitable manner. Within the cup D, upon a reduced central extension, I), of the magnet B,

is secured a thin disk or disks, a a, 850., of magnetic metal, placed, where two or more are used, parallel with each other, and in planes at right angles to the end of the bar-magnet with which they are connected, or nearly so, said disks forming flattened or reduced extensions of the pole of the magnet, and serving to give increased eflficiency to the variations or disturbances in the degree of polarity therein.

(No model.)

Within the cup, adjacent to the disk, or between the disks, where two or more are employed, the extension I) has a coil, 0, wound upon it, the ends of which extend to and connect with the coil or helix C outside the cup, the disksa a, &c., and the coil 0 being arranged within and inclosed by the cup and its cap or diaphragm, as shown. By this arrangement greater intensity is given to the disturbances or variations in degree of polarity in the different parts of the pole of which the cup and the disks form a part, and with which the two coils are connected. Very good results have been obtained with the cup made of non-magnetic material, such as wood, brass, or hard rubber.

The action is similar to that described in Letters Patent granted to Lockwood and Bartlett August 10, 1880, No. 231,065; but by my construction and arrangement of parts the disturbances or variations in degree of polarity between the different parts of the pole of the magnet are increased or intensified, and therefore these parts may be made of any suitable or preferred material.

Having now described myinvention,Iclaim- 1. In a telephone-receiver, a magnet projected within and in combination with the cup or hollow chamber, to which the diaphragm and ear-piece are secured, said magnet being provided with thin magnetic disks, and a coil arranged within said cup, substantially as described.

2. The combination, with the cup or sound chamber, of a magnetprojected within said chamber, magnetic disks forming flattened extensions of the pole thereof, and a coil or helix arranged between the disks and within the receiver-cup, substantially as described.

3. The combination, with a hollow metal cup of a receiver, of a bar-magnet projected within-said cup, magnetic metal disks secured thereto, a coil arranged between said disks and within the cup, and a second coil arranged upon the magnet outside the cup and connected with the inner coil, substantially as described.

In testimony whereof I have hereunto set my hand this 19th day of May, A. D. 1881.

HENRY E. WAITE. 

